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Showing history of clans
That would be nice to know from a player which clans that he/she was playing with! We have several times during the war time asked for apply and when we accept them found out they were just spies! This is also not fare and a bit kond of falsing to stop that would be nice to know where this person came from!
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Spying is part of the game. If you're clan can't tell who the spies are, it's time to find a new clan.
Theres no problem with spying. You just need to find a way to deter them. First of all, you should definitely put your clan to invite only. Putting it to "Anyone can join" is just asking for spies.
Option 1 - Create a password for your clan. When recruiting via Global/Forums, you can tell the people to use this password in the invite message to join your clan. Spies that join won't use this password, and this is how you can detect them and reject their invite.
Option 2 - Close your clan. Simple, if nobody can join, spies can't join. This is an easier and simpler method than Option 1, although if you do wars regular and still want to recruit, I'd recommend Option 1.